SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f45870f68499001c97191d386ba83fd357d3592c96aa3aa998d0b6b5766249' 
  AND token = 'RTy0NVFu/F4qreJowOGrfLASF8db+hPwmz7hvAtD6fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}